Upgrade to GCP-BOM 26.60.0

[Abacn]

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[Abacn]

single test failure testFlattenPCollResumeFromCheckpoint not related to this change. Fixed in #34974

[Abacn]

R: @liferoad

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[Abacn]

R: @damccorm